$Tesla Motors(TSLA)$Tesla tells U.S. lawmakers Autopilot requires 'constant monitoring'Tesla Inc (TSLA.O) defended the safety benefits of its advanced driver assistance system Autopilot and its Full Self-Driving (FSD) capability but acknowledged they require "constant monitoring and attention of the driver."Democratic Senators Richard Blumenthal and Ed Markey wrote Tesla Chief Executive Elon Musk on Feb. 8 raising "significant concerns" about the electric-car maker's Autopilot and FSD systems which have prompted scrutiny from safety regulators.In a previously unreported March 4 letter to the senators, Tesla's senior director, public policy and business development Rohan Patel, said the features enhance the ability of its customers "to drive safer